Maintaining contact with drug users.
Sheehan
A
A
D006801:Humans; D008691:Methadone / Q000627:therapeutic use; D008962:Models, Theoretical; D009426:Netherlands; D011320:Primary Health Care / Q000458:organization & administration*; D019966:Substance-Related Disorders / Q000188:drug therapy / Q000628:therapy*
D008691:Methadone